George cahill



@uitrit gister', getest @fitte GEORGE GAHILL, 0E NEW YORK, N". Y.,-'Assie-N0E 'ro ISAAC e. JoHNsoN,Y

' J. E. HUNTER7 AND PETER P. KELLER, or SAME PLACE.

Laim Patent No. 77,453, mamy 5, 186s.

I-MPROVjED MACHINE FOR TAPPING AND DRILLING.

TO ALL WHM IT MAY CONCERN:

Be it known that I, GEoneE GAHILL, of the c-ity,county, and State of New-York, have invented a new and improved Tapping and Drillingll/Iachine; and I do hereby declare that the following is a full, clear, and'exact description thereof, which will enable others skilledv inthe art to Amake and use the same, reference being had4 to the accompanying drawings, forming part of this specification, in whichl Figure l represents a side elevation of my improvedltappin'g und drilling-machine. Figure 2 is a detail elevation of the opposite side. 3 Figure 3 is a, detail horizontal section of the same, taken -on the plane of the line-a.' x, fig. 11 Figure 4 is a detail horizontal section of the same taken en theplane of the line y y, iig. 2.

Similar letters of reference indicate corresponding parte.`

The'object of this invention is to facilitate the setting of the turn-over tap-stocklof a machine for tapping or drilling pipe-iittingshwitho'ut requiring the shaft on which the device turns to be stopped for such setting of the tap-stock. i

In the machine herein referred to, a tap-stocker chuck, 4having two or more arms of diiererit diameters, is hung by a' pivot in the forked e'nd of a rotating spindle. When a pipe or elbow of different diameter from that previouslyvworked on isto be tapped, the stockmust be turned so as to bring the desired arm into line with the axis of the spindle. To turn the stock for this punpose is the object of my invention.

Heretofore such adjustment couldvonly be performed by stopping the motion of the spindle, or by, with danger tolife and limb of the operator, drawing out by hand` the lpin that locks the stock, turning by hand the stock totherequired position, and replacing thefpin, all while the spindle is in motion. It' the spindle i's stopped, the operation of the machine is seriously delayed.' If the stock is released, set, and relocked, by hand, during the revolution of tbespindle, the operation is also frequently delayed, and is certainly made uncertain and dangerous. f

n An improvement which would obviate the aforesaid drawbacks, and which would permit the shifting of taps without delay or annoyance, is, therefore, a great'desideratum, and isV fully obtained by my invention.

My invention consists in connecting with the fork of the spindle a'vlever, which, when raised or depressed, withdraws the stop-pin, vand then turns the stock in the'desired direction, and allows the stop-pin to -resuine its original position, and to lock the stock, until anotherchange is required. I v

'.lhe' lever does not turn on or with the spindle, and is always within easy reach, so that the stock can be set with ease and facility without interrupting the motion ofthe spindle. i

Upon the solid part or top of the fork'A of thev spindle B is fitted anAup-and-down slidingodllar, C, which I i turns with thespindle, and rises or falls lwith it, but which also slides up and downA upon it within the space provided for it between two shoulders, a and b, on the spindle, so that it has a suitable desired play. Around the collar C isa friction-band, (2 having two,l pins d dat opposite points, which pins serve as pivots and supports to a lforked lever, D, as shown. The forks of the lever D project beyond the spindle, as shown in Eg. 4, and are furnished with upright curved fingers e e, that take hold loosely ofthe edge of thee'ircular shoulder or disk a, which is secured to the top ofthe spindle-fork, and which, consequently, serves the double purpose of astop,y

to keep the collar C in place, and of a ilerum for the lever D, when itis operated. i

The ends of the forks of the leverD are pivoted to a forked jointed bar, which ishingedto the under l side of a stationary bracket, f, oi` which can be attached to the face of the upright, F, th:rt supports the brackets, and which jointed bar serves to keepthe lever D from turning with the'spindle. v j

I When the construction of the fork does not admit of the use of the collar C, band c, lever D, and arm E, the lever can be directly' pivoted to thefork', and can then be used without any material difference in oect, as the principle of operating by means of a le'vcrremains thc'same; the only difference being, that, in one oase, the lever stands still, and in theother it revolves with the spindle. I

l To operate the stop pin, there is placed on one face of the fork aljointeil lever, G, which is properly connected with the collar C, when that is used, or, if the lever D is 'dircctlypivoted to the fork, with the lever. The lower end ot" the lever G is pivoted to a'swinging cam, H, which is -pivoted to one face of thc foi-k A, and which has a cam-flange, g, as in fig; 1. l i

Iis the stoppin,vtting.through the fork into thc stock YThe pin I has an upward-projecting pin, lz, with a V-shaped inner face, as in fig. 3, which pin h is, by a coiled spring, forced against the face oi' the' fork. When-the levcrD is raised, as'shown by -red lines in iig. 1, the cam'H is brought between the lug 7i and the fork A,and draws the pin I out of the'stock, i

On the other face ofthe fork are two lcvers,lK K, pivoted to the fork, and carrying each aprojecting pin, j, that is tted through :i slotted strap, L, which is connectedv with the collar C, when it is used, or with the 'lever D, if the same is directly pivoted to theA fork A, and which acts, when raised or lowered by mcansof tho lever D, upon the pins and thereby oscillates'thc levers K. Through the lower slotted end of the strap L is tted athumb-screw, 7:, which 'serves to keep the lowerend of the strap in place.' The pins jj fit through Vslots in thostrap, which are either square, round, or elliptic, and which' are'designed to be somewhat larger than the pins upon whiohtbey act, for a reasonto be hereinafter shown.4 l

From the arms K project ear-sl l, into which are swivel-led respectively vertical rods M M, each of which' is provided rat its upper end. with adjusting-nuts, as shown, for suitably adjusting the rods,'aud permitting them Vto. play easily in the swivels, 'as the arms K K rise and fall.

To the lower ends of the rods, MM are respectively attached' two arms N N, which turn loose on the pin O 4 that carries the stock J, and which arms N act 4on the' toothed edge ofja disk, P, that is mo'unted on the pin I Outsideof the arms N is arrauged,raroundthepin O, a rubber disk', between two plates ofl thin metal,

which rubber disk constitutes a spring for the purpose ofkeeping thearms N N tightly pressed against the face fthe aiu; P. i 1

When `it is required to use only two taps, a shoe,m, is placed .under onevof, the arms N, and a thumbscrew,

w, is placed in oneof four,vmoro or less, hole's ofthe disk P, as shown ini'g. 2.- By these means,the disk and ,shaft O are acted upon by one arm,'N, only, the other being raised by the shoeahbovc thc projecting cam-points of the disk, and is thus inactive, though freevto mov'e up or down.' 4 i i This device of the shoe and thumb-screw produces `an Aalternate or oscillating movement, and enables the workman to use two taps, wh'cnneeessary, without loss ot time; one pressureof the hand on the lever D causing the turn-over or `stock t swing. in one direction, and the next pressure causing it to more back again. When the shoe and thumb-screw are `notrequred, they are removed.4 t

. Without the shoe' and thumb-screw, the inotiou of the crown-shaft O, .and consequently ofthe stock, turny over, or tapsstocl: J, is in'one direction only, whether thelever D is moved up or down. '.lhus, when lche lever is pressddowm'oneof the arms N pushes the crowx'rlon the.. shaft O by means of one of. itsponts or teeth, while the other arm N passes over a. point'or tooth. When ,the lever is raised, the disk is pulled a quarter turn by the other arm 4N,fwl.iilethe arm which'actedI with the downward motion now passes over the points orV teeth of the disk P. Thesccam-shaped teeth are four, or more or less, in numberand are all pointed in one dii-eel tion, so that force can only be applied toproduce a movement lin one direction, though itselfapplied in two hopposite directions, upward and downward; I-t is :thought that no means so simple and cJa'siIy constructed as v tbese'can be applied and, used as e'iectually to accomplish the same results.

'The action of the different parts is-further explained thus:

A The lever D, .when moved or down by the' hand of'the workman, imparts lmotion to the arm or lever G, -and' to the slotted strap L, which motion is designed, in a full-sized machine, to extend through thespace of ,4 y,half an inch, more or less. n i

During the iirst part of this motion-the cam Hfswings and passes beneath the head h of thc stop-pin I, and lifts'it'out of its hole in the turnsover, Aand leaves-thc latter freeto move. Then the strap L begins to act on Athe pins inthe armsv K K, havng5iwl1le the com H was turned, mved without alecting the arms K, because of the enlarged slots through which the pins j pass, and. upon which the strap acts. Thestrap L and camsH now move together through4 thcnext partof the motion; the strap L,by means of Iits connections, acting on the shaft O ofthe turn-over or tap-stock, and'thccam h sustaining the stop-pin until near the end of the move, fwlien it swithdrawn from beneath the head of' the pin, and thnspcrmts the pin at the proper time to drop into the proper recess or hole in the turnover, and to thus 'secure thc same in its new position. The'cam is shown .by ied lines in ',fig. lto be near the end of its stroke. p f v Thus', bythe-aforesaid means," which are simple enough in themselves, one pressure of a lever, either upward or downward, `enables the workman ito chang'c his taps quickly and safely, without delay, danger, or annoyance, at the 'quickest speed ofthe yInadliine at which he may bc working.

Having thus described my invention, what I claim as new, and desircto secure by Letters Patent, is-

1. The combination of thccollarC, friction-band e, forked lever D, fingers c c, shoulder a, jointcd'arm E, or their respective-equivalents, all constructed and arranged in the manner and for the purpose specified and4 set forth. l I I 2. Iclam the system of lovers G, cam H, andv pin '1, when constructed, combined, 'and applied to the forked-v spind'lepof a) tapping-inachine, in the manner-tand for the purpose herein specified and set forth.

. shaft O, diskR, all constructed vandcombizied, and all applied to and used upon 3. .l claim the fiked lever D, movable collar C, slotted strap L, the lever-arms KK, rods M M, arms N N,

I the forked spindle of :1 tappingv machine, in the manner vand for the purpose speced and setlfoi-th.

4.'I claim vthe improved tapping-machine, consisting of the several parts hel'einbefore specified, all constructe. and arranged substantially as described. I I

GEORGE CAH'ILL. Witnesses: I'

CHARLES S. GILcHREsT, D. N. VAN ZANDT. 

